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"short cable" fix for DP8315

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Derived from:	netbsd and tech note at soekris web site
MFC after:	1 week
This commit is contained in:
Sam Leffler 2003-08-19 16:57:00 +00:00
parent e540880d41
commit 0143cfd730
1 changed files with 23 additions and 0 deletions
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23
sys/pci/if_sis.c
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@ -2146,6 +2146,29 @@ sis_init(xsc)
SIS_CLRBIT(sc, SIS_RX_CFG, SIS_RXCFG_RX_TXPKTS);
}
if (sc->sis_type == SIS_TYPE_83815 &&
IFM_SUBTYPE(mii->mii_media_active) == IFM_100_TX) {
uint32_t reg;
/*
* Some DP83815s experience problems when used with short
* (< 30m/100ft) Ethernet cables in 100BaseTX mode. This
* sequence adjusts the DSP's signal attenuation to fix the
* problem.
*/
CSR_WRITE_4(sc, NS_PHY_PAGE, 0x0001);
reg = CSR_READ_4(sc, NS_PHY_DSPCFG);
CSR_WRITE_4(sc, NS_PHY_DSPCFG, (reg & 0xfff) | 0x1000);
DELAY(100);
reg = CSR_READ_4(sc, NS_PHY_TDATA);
if ((reg & 0x0080) == 0 || (reg & 0xff) >= 0xd8) {
CSR_WRITE_4(sc, NS_PHY_TDATA, 0x00e8);
SIS_SETBIT(sc, NS_PHY_DSPCFG, 0x20);
}
CSR_WRITE_4(sc, NS_PHY_PAGE, 0);
}
/*
* Enable interrupts.
*/